1997 Chevrolet Blazer Owner's Manual - Page 117

You can adjust the crossrails to handle different sized loads. Just loosen the slider knobs at each end of the crossrail and move them to where you want them. Make sure both sides of the crossrail are even. then tighten the slider knobs. Carrying small, heavy loads on the roof is not recommended. Tie the load to the moveable tie down (two per each side of the side rails). Use the crossrails only to keep the load from sliding. If you need to carry long items, move the crossrails as far apart as possible. Tie the load to the moveable tie downs provided in the side rails. Also tie the load to the bumpers. Do not tie the load so tightly that the crossrails or side rails are damaged. Be sure the cargo properly loaded. Follow these guidelines: is Remove the center rubber strips in the crossrails and attach the GM accessory rack to the nut plates provided through the center slots (four per crossrail ). The tap plates can be moved to accommodate various positions by sliding them inside the crossrail to the desired locations before mounting the acccssory rack. 2-60